Strap-clamp.



A. ROBINSON.

STRAP CLAMP. l APPLICATION FILED SEPT- 25, ISIS- lPafented June 20, 1916.

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lll 'lll /1 TI'ORIVEYS ABRAHAM ROBINSON, OF NEW YORK, N. Y.

STRAP-CLAMP.

specincauon of Letters Patent. Patented June 20, 1916,

Application led September 25, 1915. Serial No. 52,559.

To all 'whom z't may concern:

Be it known that I, ABRAHAM ROBINSON,

a citizen of the United States, anda resident of New York, in the county of New York and State of New York, have in- .vented certain new and useful Improvements in Strap-Clamps, of which the following is a specification.

My invention relates to means for holding straps in place upon a desired support,

such as the straps supporting the springs in the upholstermg of furniture, and one of the main objects thereof is to provide such means which are positive in actlon as well as permanent and which will not injure the fabric of the straps nor permit said straps to have strain placed thereon other than across the entire width thereof, thus insuring full efliciency of the straps.

v My invention is fully described in the.

following specification, of which the accompanying drawings form a part, in which like characters refer to like parts vin each of the views, and in which Figure 1 is a sectional view of a portion of the frame of a chair rovlded with an upholstered seat providedpwith my invention; Fig. v2 is an enlarged, detached, outer plan view of my invention; Fig. 3 is a section taken on the line 2-2 of Fig. 2;- and Fig. 4 is a perspective .view of the inner surface of my invention, as separated from the strap.

In Figs. 1 and 2 I have illustrated, fragmentarily, and in section, the Kframe 5 ofl a chair provided with the bottom frame formed by strips 6, shown as removable from the frame 5, and to which the conventional strips or straps 7 are Secured to sustain the springs 8 in turn supporting the seat cushion 9. My invention is designed to hold the ends of said straps to supplant the tacks now employed and which tacks frequently pull out or cause the fabric of the straps to tear and thus render the straps functionally useless or practically so. My clamps, however, insure positive and permanent anchoring of the ends of the straps, although said clamps are removable if removal is desired for any purpose and, further, an even strain across the entire width of the straps is insured instead of at the points of present tack attachment.

My invention consists of a plate 10 pro- .illustrated in Fig. 3.

vided with a longitudinal slot 11 and with a plurality of screw-holes 12 for the passage of screws 13 to hold the same to the frame strips 6; the outer surface of the plate 10 is smooth but the inner surface is provided with lthree rows of teeth, 14, 15, and 16, of which the first two rows'border the slot 1l and the last row borders the edge farthest removed from the slot l1. These rows of teeth are clearly shown in Fig. 4, and it will be particularly noted that the teeth ofthe rows 14 and 15 are staggered with respect to each fora reason later pointed out.

In practice, one end of a strap 7 is passed through the slot 11, from ,the smooth side ofthe plate 10, and laid over the rows 15 i and 16 of teeth, after which the body of.

vrows piercing the material of the strap 7 and entering the wood intowhich the screws 13 are driven, this being clearly The body of the strap 7 is drawn ytaut over the inner sury face of the plate 10 previous to securing the latter in position in order that the strain placed upon the strap by the weight of a person will be carried entirely by the smooth edge 17, of the plate, although the, row 14 of teeth may contribute somewhat to the anchoring of the strap 7, and the rows 15 and 16 ma also contribute thereto, but the principal unction -of the rows 15 and 16 1s to hold vthe end of the strap 7 against any possibility of Slipping. Inasmuch as these Straps are usually made of coarse fabric which is pierced by the teeth, I stagger the teeth of the rows 14 and 15 in order to prevent the teeth of one row from enlarging a possible tear by a tooth of the other row, in other words, I double the holding power of the teeth in the two rows by arranging them between different longitudinal threads of the fabric.

If the screws 13 should become loosened from any cause, the teeth of the several rows would, not hold the strap in all probability, but the edge 17 will and does sustain any weight that might be placed' upon the strap, the downward pressure ofthe body of the strap on the enel` of the strap maintaining v said end in positive engagement with the teeth of the row 16, and this prevents slipping of the strap with respect'to the plate 10. rIhis prevention against slipping of the strap is also aided by the screws 13, and it will thus be seen that a positive anchoring of the strap at its ends results with the x strain evenly distributed across the entire and hereinbefore described, as many other f uses thereof will suggest themselves, and l reserve the right to make such structural changes over the formi shown and described as come within the scope of the appended claims and Within the spirit of the invention.

Having fully described my invention,

y menace what ll claim as new, and desire to secure loy Letters Patent, is

1. As an article of manufacture, for use with a strap, a clamp, comprising a slotted plate provided with a row of teeth along one edge thereof and with a row of teeth along each edge of said slot.

2. As an article of manufacture, for use with a strap, a clamp, comprising a slotted plate provided with a row of teeth along one edge thereof and with a row of teeth along each edge of said slot, the teeth of said last named rows being staggered with respect to each other. y

3. As an article of manufacture, for use with a strap, a clamp, comprisinga slotted plate provided with a row of teeth' along one edge thereof, with a smooth edge at the opposite edge thereof, and with a row of teeth along each edge ofvsaid slot.

' In testimony whereof ll have signed my name to this specication in the presence of two subscribing witnesses.

ABRAHAM RBINSUN. Witnesses i J. E. LARSEN, PHILIP D. RoLLHAUs, 

